Career
Melnjak started his career in the lower tier NK Nedeljanec, spending most of his youth career there, apart from two seasons at Varteks Varaždin at U-15 level He remained a first team player in the following season, and moved on to the Prva HNL team Slaven Belupo at the beginning of the 2013/2014 season. On February 2, 2015 Melnjak signed a contract with Belgian side Sporting Lokeren for 3 and a half seasons.